Standard model GB30 GB21 GB/T5780 GB/T5781 GB/T5782 GB/T5783 GB/T5789 GB/T799
Material of common round steel (Q235) 35 # 45 # 16 mn 35 crmoa 40 cr (345 b)
Level 4 4.8 5.6 6.8 8.8 10.9 12.9
Tolerance of gb
There is no limit on the nominal diameter
Surface treatment (1) color (2) 3) electroplating zinc powder coating of the plating solution
Supply from stock